Aneumastus pseudotusculus
(Hustedt) Cox and Williams 2000 Category: Symmetrical biraphid
BASIONYM: Navicula pseudotuscula Hustedt 1943
SYNONYM(S): Mastogloia pseudotuscula (Hustedt) Loseva 1982
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 40-50 µm
Width Range: 16-17 µm
Striae in 10 µm: 12-16
Description
Valves are lanceolate with protracted apices. The axial area is relatively straight and expanded in the center to form an unequal, irregular rectangular central area. The raphe is lateral and reverse-lateral. The external proximal raphe ends are dilated. Striae are radiate, except at the apices where they become parallel. Striae are composed of small, nearly square to dash-like areolae.
This species has only been confirmed in the upper midwest of the U.S.
Original Description
Basionym: Navicula pseudotuscula
Author: Hustedt 1943
Length Range: µm
Striae in 10 µm:
Original Description
Navicula pseudotuscula nov. spec. (Syn.: Navicula arata Hust., Bot. Arch. 38, S. 194, F. 21, 22, non N. arata Grun.!). Schalen linear-elliptisch mit mehr oder weniger stark geschnäbelten bis schwach kopfig abgeschnürten Enden, 35-70 µ lang, 12-17 µ breit. Raphenäste gerade, nur mit einer kaum merklichen Ausbuchtung der äußeren Raphenrinne, Polspalten klein, nach derselben Seite abgebogen. Axialarea sehr eng, linear, Zentralarea eine schmale, kurze, unregelmäßig begrenzte Querbinde. Transapikalstreifen im allgemeinen leicht radial, an den Polen senkrecht zur Mittellinie, etwa 14 in 10 µ, zart, aber deutlich punktiert, Punkte in der Randzone dichter stehend, gegen die Mittellinie etwas aufgelockert, hier etwa 10-12 in 10µ.
Original Images
Cite This Page:
Kociolek, P. (2011). Aneumastus pseudotusculus. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/aneumastus_pseudotusculus
Species: Aneumastus pseudotusculus
Contributor: Pat Kociolek
Reviewer: Sarah Spaulding
Image Credit: Pat Kociolek
- Striae 12-16 in 10 µm
- Apices protracted
- Areolae evenly arranged
Valves are lanceolate with protracted apices. The axial area is relatively straight, expanded in the center to form an unequal, irregular rectangular central area. Areolae are small, evenly arranged and nearly square, to dash-like.
Compare
Aneumastus pseudotusculus differs from Aneumastus tuscula by the finer striae and smaller valves. It differs from Mastogloia smthii by having coarser striae, a narrower central area, larger valves and by lacking partecta.
Mastogloia smithii
Aneumastus tuscula
(Ehrenberg) Mann and Stickle in Round, Crawford and Mann 1990
Citations
Cox, E.J. and Williams, D.M. (2000). Systematics of naviculoid diatoms: the interrelationships of some taxa with a stauros. European Journal of Phycology. 35:273-283.
Hustedt, F. (1943). Die Diatomeenflora einiger Hochgebirgsseen der Landschaft Davos in den schweizer Alpen. Internationale Revue der gesamten Hydrobiologie und Hydrographie 43:124-197, 225-280.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: